I have adjustable rivet gun

[starcraft]

When I use mine it pulls all way through and does not snap off metal. Is this normal.

[barts]

If your rivet gun cannot grip the mandrel properly, either the jaws are oily or the jaws are worn out. Is that what you asked?

- Bart

[idroba]

Often poor quality rivets can cause this issue. Also, holes too big and rivet length too long for the application.

[ROBERT CROSS]

Aluminum rivets on aluminum panels, usually werks best.
Never mild steel!

Stainless can be useful when extra strength is needed, but can be difficult to shear, especially over 1/8".

Use a backing washer whenever possible, same material.

Bob